Users Guide

Switch Management Commands 2089
Default Configuration
DHCPv4 is disabled by default on routing interfaces.
Command Mode
Interface (VLAN) Configuration mode
User Guidelines
This command only applies to VLAN routing interfaces. When DHCP is
enabled on a routing interface, the system automatically deletes all manually
configured IPv4 addresses on the interface.
• The command no ip address removes the interface’s primary address
(Manual/DHCP) including the secondary addresses, if configured, and sets
the Interface method to None.
• The command no ip address dhcp removes the interface’s primary address
only if configured through DHCP and sets the interface method to None.
It does not remove a manually configured address.
In addition to leasing an IP address and subnet mask, the DHCP client may
learn the following parameters from a DHCP server:
• The IPv4 address of a default gateway. If the device learns different default
gateways on different interfaces, the system uses the first default gateway
learned. The system installs a default route in the routing table, with the
default gateway’s address as the next hop address. This default route has a
preference of 254.
• The IPv4 address of a DNS server. The DNS client stores each DNS server
address in its server list.
• A domain name. The DNS client stores each domain name in its domain
name list.
A VLAN routing interface configured for DHCP address assignment will send
the following text string in DHCP Option 60 of the DHCPDISCOVER
message to assist the DHCP server in identification of the switch:
"DellEMC;<switch model>;<firmware version>;<serial number>". The
left and right angle brackets and quotation marks are not sent. An example
option 60 string might be: DellEMC;N2128PX-
ON;6.5.2.0;TW06G93K282986CR0040